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Table of Contents: August 2007

COVER

The Elephantidae phylogeny and mastodon (Mammut americanum) outgroup.

Image Credit: Background painting by George Teichmann (http://www.iceagebeasts.com/) from the Yukon Department of Palaeontology Art Collection, Accession number 13 (http://www.beringia.com/). Skeleton sketch from Lehrbuch der Geologischen Formationskunde by Emanuel Kayser, published by Verlag von Ferdinand Enke, Stutgart, Germany, 1902. Photograph of tooth by Paul Matheus. Overall illustration created by Sabine Giesser and Knut Finstermeier
Issue Image

The complete mitochondrial genome sequence from a mastodon tooth dated to 50,000–130,000 years ago that was recovered in Alaska clarifies the evolutionary history of elephants and mammoths. Using the mastodon sequence as an outgroup allowed the unambiguous determination that the mammoth and the Asian elephant are sister species and also provided a time scale for the speciation of mammoths and the elephant species (see Rohland et al.).

Synopses

Unsolved Mystery

Research Articles

Flight Speeds among Bird Species: Allometric and Phylogenetic Effects

Thomas Alerstam, Mikael Rosén, Johan Bäckman, Per G. P Ericson, Olof Hellgren

Proboscidean Mitogenomics: Chronology and Mode of Elephant Evolution Using Mastodon as Outgroup

Nadin Rohland, Anna-Sapfo Malaspinas, Joshua L Pollack, Montgomery Slatkin, Paul Matheus, Michael Hofreiter

Monotonic Coding of Numerosity in Macaque Lateral Intraparietal Area

Jamie D Roitman, Elizabeth M Brannon, Michael L Platt

Spatial Learning Depends on Both the Addition and Removal of New Hippocampal Neurons

David Dupret, Annabelle Fabre, Màtè Dàniel Döbrössy, Aude Panatier, José Julio Rodríguez, Stéphanie Lamarque, Valerie Lemaire, Stephane H. R Oliet, Pier-Vincenzo Piazza, Djoher Nora Abrous

Open Syntaxin Docks Synaptic Vesicles

Marc Hammarlund, Mark T Palfreyman, Shigeki Watanabe, Shawn Olsen, Erik M Jorgensen

Precise Positioning of Myosin VI on Endocytic Vesicles In Vivo

David Altman, Debanjan Goswami, Tama Hasson, James A Spudich, Satyajit Mayor

The p75 Neurotrophin Receptor Is a Central Regulator of Glioma Invasion

Angela L. M Johnston, Xueqing Lun, Jennifer J Rahn, Abdelhamid Liacini, Limei Wang, Mark G Hamilton, Ian F Parney, Barbara L Hempstead, Stephen M Robbins, Peter A Forsyth, Donna L Senger

Targeted Inhibition of miRNA Maturation with Morpholinos Reveals a Role for miR-375 in Pancreatic Islet Development

Wigard P Kloosterman, Anne K Lagendijk, René F Ketting, Jon D Moulton, Ronald H. A Plasterk

Aging Hematopoietic Stem Cells Decline in Function and Exhibit Epigenetic Dysregulation

Stuart M Chambers, Chad A Shaw, Catherine Gatza, C. Joseph Fisk, Lawrence A Donehower, Margaret A Goodell

Myc Dynamically and Preferentially Relocates to a Transcription Factory Occupied by Igh

Cameron S Osborne, Lyubomira Chakalova, Jennifer A Mitchell, Alice Horton, Andrew L Wood, Daniel J Bolland, Anne E Corcoran, Peter Fraser

Tetrameric Structure of Centromeric Nucleosomes in Interphase Drosophila Cells

Yamini Dalal, Hongda Wang, Stuart Lindsay, Steven Henikoff

Structural Basis of PP2A Inhibition by Small t Antigen

Uhn Soo Cho, Seamus Morrone, Anna A Sablina, Jason D Arroyo, William C Hahn, Wenqing Xu

Nitroimidazole Action in Entamoeba histolytica: A Central Role for Thioredoxin Reductase

David Leitsch, Daniel Kolarich, Iain B. H Wilson, Friedrich Altmann, Michael Duchêne

Correspondence

No Forest Left Behind

Gustavo A. B da Fonseca, Carlos Manuel Rodriguez, Guy Midgley, Jonah Busch, Lee Hannah, Russell A Mittermeier